In the past few months Americans have become familiar with the myriad ways the government tracks our e-mails, phone calls and social media usage. According to a new report from the American Civil Liberties Union, you can almost certainly add your car's license plate to that list.

Their investigation into license plate reader use in 38 states and the District of Columbia reveals that law enforcement officials are amassing large amounts of data gathered from police on patrol who have license plate readers attached to their cars. The readers snap photos of every passing car, not just ones suspected of criminal activity. An eight-hour patrol shift can collect more than 7,000 license plates.

While the readers can be helpful in identifying people wanted for crimes, the issue lies with the data they collect and how long that data is kept by the agencies themselves, fusion centers and private companies, the ACLU says. When that information is stored long-term and collated, it becomes a powerful tracking tool:

What can location data reveal about people? Trips to places of worship, political protests, or gun ranges can be powerful indicators of people’s beliefs. Is it really the government’s business how often you go to the drug store or liquor store, what doctors you visit, and the identities of your friends? I’m sure all of us can remember something from our past that could embarrass us. If the government comes to suspect you of something in 2020, should it have access to databases stretching back years that could dig up facts about you that previously went unnoticed?

Policies on how long law enforcement can keep this data is not regulated at the federal level and vary from locality to locality, the report says. They can keep the data anywhere from 48 hours in Minnesota to presumably forever in Texas. There is also no oversight of how private companies use this data, and only five states have any laws on the books at all dealing with plate readers.

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The ACLU suggests regulating how long this data can be retained. They say they would prefer it be kept only a few days or weeks, not indefinitely. They also recommend that law enforcement not share the data with third parties, that people be allowed to see if they are in a plate database, and that agencies who use the readers report this fact publicly.

It's certainly true that these readers can be a useful law enforcement tool. But personally, my issue with them — and I have the same issue with PRISM and other tracking tools that have come to light — is that they use a blanket approach that treats all Americans like potential criminals. In our system, we are presumed innocent until proven guilty, and these technologies run contrary to that long-held legal concept.

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Click here to check out the ACLU's full report. It's eye-opening, to say the least.